Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5105a92321222b…

MALICIOUS

PDF

47.5 KB Created: 2020-10-27 16:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 43b4ca7a986537ec2973f3ed54d332db SHA-1: 2bee221b4e0337e6ddd9ee0de14fa82e1eb397c4 SHA-256: 2f5105a92321222b1fc8a8c2488d2ce3127850fd3b1c46c699df3aa382ac32a5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the structure and link farm nature suggest an attempt to manipulate search engine results or redirect users to malicious content, potentially for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=misa+amane+cosplay+wig In PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/guxiradirurov.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/seruremewipizir.pdfIn PDF document text
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/pegete.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/6b59573d6616c62.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/5091743.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/9249274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f919af7da5ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f87a74fd8363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f87f2d8dc84b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/how_old_is_gimli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0752/7077/files/manual_de_usuario_refrigerador_frigidaire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9445/1385/files/android_website_blocker_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/gofasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/19125127801.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/como_preparar_un_plan_social_media_marketing.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/11294194918.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/zabotozufalogesob.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008d85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8D85 21048 bytes
SHA-256: 01485fade503a196b568338dc869d3610af609e65bc742b98162fb98a4d01368
font_00_sfnt_off0000565b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x565B 5356 bytes
SHA-256: 66743235905cf2449ce974e35190cf524fb67e47c7db2931f5fae94f7f8aa807
font_01_sfnt_off0000689f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689F 10864 bytes
SHA-256: deea3c5f71cf6b89bf0d8f716d868ae7228db7030c52383a7768559ee8735696